Few years ago, I opened the twitter account "@herr_doepel" to communicate with my students. As I left NUS in December last year, this account lost its role. However, I'm going to teach a seminar on media in foreign language teaching next semester. The account will be used to exchange information with the students in this seminar. So, please don't get confused by some notes, which are unusual for the former purpose. Feel free to unfollow the account. I won't take it personal.